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Incipient Melting and Corrosion Properties of Friction Stir Welded AA2024 T3 Joints

Alfaro Mercado, Ulises and Biallas , Gerhard (2010) Incipient Melting and Corrosion Properties of Friction Stir Welded AA2024 T3 Joints. 12th International Conference on Aluminium Alloys (ICAA 12), 5.-9. September 2010 , Yokohama, Japan. ISBN 978-4-905829-11-9.

Full text not available from this repository.

Abstract

The effect of welding speed on strength and corrosion behavior of FSW 2024-T3 joints was investigated in the present study. For both strength and corrosion, the transition from the thermo-mechanically affected to the heat affected zone (TMAZ/HAZ) turned out to be the most critical site. Higher welding speeds produced both a smaller hardness drop in the TMAZ/HAZ and a smaller width of the softened zone. Thereby, tensile strength could be improved and the intergranular corrosion attack localized to the overaged TMAZ/HAZ could be reduced. Paradoxically, at lower heat input (i.e. at higher welding speed), the weld nugget region also suffered enhanced intergranular corrosion. SEM examinations of the top surface of FSW 2024-T3 joints revealed the presence of constitutionally melted Al2MgCu (S-phase) particles in that region. The S-phases were mainly localized to the advancing side of the joint, and their volume fraction increased with growing welding speed. Hence it is suggested that a focalization of the thermal source resulted in incipient melting. Eutectic S-phases were formed and served as preferential corrosion sites lowering corrosion resistance of the weld nugget.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Incipient Melting and Corrosion Properties of Friction Stir Welded AA2024 T3 Joints
Authors:
AuthorsInstitution or Email of Authors
Alfaro Mercado, Ulisesulises.alfaro@dlr.de
Biallas , GerhardGerhard.Biallas@haw-hamburg.de
Date:September 2010
Page Range:pp. 978-983
ISBN:978-4-905829-11-9
Status:Published
Keywords:FSW, Constitutional melting, Corrosion
Event Title:12th International Conference on Aluminium Alloys (ICAA 12)
Event Location:Yokohama, Japan
Event Type:international Conference
Event Dates:5.-9. September 2010
Organizer:The Japan Institute of Light Metals
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Ulises Alfaro Mercado
Deposited On:13 Dec 2010 09:44
Last Modified:13 Dec 2010 09:46

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